Chapter 8 Metamorphic Rocks

Their chemical composition will be nearly the same.

Generally speaking, how does the chemical composition of most metamorphic rocks compare to that of the parent rock

Preexisting rock is altered through heat and pressure.

How are metamorphic rocks formed?

Sand grains are fused together because of high temperatures

How is quartz sandstone metamorphosed into quartzite during contact metamorphism?

perpendicular to the direction of plate movement

How will foliation in continental metamorphic rocks formed during subduction be oriented?

Muscovite

If clay minerals in a sedimentary rock were buried at a depth where subsurface temperatures exceeded 200°C, which common metamorphic mineral would they become?

Along the axis of a mid-ocean ridge system

In which geologic setting is the most widespread occurrence of hydrothermal metamorphism found?

Regional metamorphism

________ is a widespread type of metamorphism typically associated with mountain building.

Metamorphism

________ is the process by which a rock changes form or mineral content as a result of environmental changes such as heat and pressure.

Burial

________ metamorphism tends to occur in regions where massive amounts of sedimentary or volcanic materials accumulate in a subsiding basin, pushing older rocks further into the interior

aureole

a ring of metamorphic rocks adjacent to an igneous intrusion

Contact

Which style of metamorphism will be generated by a magma pluton?

Convergent

Which tectonic boundary is associated with regional metamorphism?

sometimes, but not always

Do metamorphic rocks look like the preexisting rock from which they form?

porphyroblasts

Metamorphic rocks can sometimes contain unusually large grains surrounded by a fine-grained matrix of other minerals. These large crystals are called ________.

True

Metamorphism ends when the rock begins to melt.

foliation

Roughly parallel layers of mineral crystals aligned perpendicular to the direction of pressure

False

Sedimentary rocks are always the parent rocks for metamorphic rocks.

gneiss

Shale subjected specifically to high-grade metamorphism will change into ____.

Tektites

Which of the following materials is most closely associated with shock metamorphism and meteorite impact sites?

Gneiss

Which of the following rocks represents the highest grade of metamorphism?

gneissic texture

What is an example of a foliated texture resulting from high-grade metamorphism?

banding in metamorphic rocks that results from the reorientation of minerals

What is foliation?

The rock that was altered by metamorphism

What is the definition of a parent rock?

Heat

What is the most important factor driving metamorphism

gneiss

What would you call a granite that has undergone metamorphism and now exhibits foliation?

mid-ocean ridge

Where is hydrothermal metamorphism common?

Slate

Which low-grade metamorphic rock displays thin, parallel layers and contains very fine grains of mica?

Marble

Which nonfoliated metamorphic rock is relatively soft and easy to cut?

moderate pressures at shallow depths

Which of the following best describes confining pressure and the location in which it occurs?

low temperature,hot, watery fluids,low pressure

Which of the following factors describe the metamorphic conditions at a mid-ocean ridge

low pressure,low temperature

Which of the following factors describe the metamorphic conditions in a subduction zone?

low pressure,high temperature

Which of the following factors describes the conditions at a zone where contact metamorphism is occurring

gneiss

Which of the following is a metamorphic rock

400 degrees Celsius

Which of the following is a temperature associated with metamorphism?

Sandstone

Which of the following is the parent rock of quartzite?

Slate, phyllite, schist, gneiss

Which of the following lists of metamorphic rocks places the rocks in order from lowest metamorphic grade to highest?